#include <Servo.h>  // Include the Servo library

Servo myServo;  // Create a Servo object

int servoPin = 9;  // Define the pin connected to the servo signal

void setup() {
  myServo.attach(servoPin);  // Attach the servo to the defined pin
}

void loop() {
  // Rotate the servo to 0 degrees
  myServo.write(0);   
  delay(1000);  // Wait for a second
  
  // Rotate the servo to 90 degrees
  myServo.write(90);  
  delay(1000);  // Wait for a second
  
  // Rotate the servo to 180 degrees
  myServo.write(180); 
  delay(1000);  // Wait for a second

  myServo.write(90);  
  delay(1000);  // Wait for a second
}